merge w3m-img for framebuffer support

* w3mimg/w3mimg.h: created
* w3mimg/x11/x11_w3mimg.c: created
* w3mimg/fb/fb_w3mimg.c: created
* w3mimgsize.c w3mimgdisplay.c: modified
* configure: modified
* XMakefile: modified
* config.h.dist: updated
From: Fumitoshi UKAI  <ukai@debian.or.jp>

w3m-img for framebuffer support
* http://homepage3.nifty.com/slokar/fb/
* w3mimg/fb/fb.c w3mimg/fb/fb.h
  w3mimg/fb/fb_img.c w3mimg/fb/fb_img.h
  w3mimg/fb/fb_gdkpixbuf.c w3mimg/fb/fb_gdkpixbuf.h
  w3mimg/fb/fb_imlib2.c w3mimg/fb/fb_imlib.h
  w3mimg/fb/readme.txt w3mimg/fb/license.txt: added
From: Hiroshi Kawashima <kei@sm.sony.co.jp>

w3mimg/fb/fb_imlib2.c

@@ -0,0 +1,150 @@
+/**************************************************************************
+                fb_imlib2.c 0.2 Copyright (C) 2002, hito
+ **************************************************************************/
+
+#include "fb.h"
+#include "fb_img.h"
+
+static void set_prm(IMAGE *img);
+
+IMAGE *fb_load_image(char *filename, int w, int h)
+{
+  Imlib_Image image;
+  IMAGE *img;
+
+  if(filename == NULL)
+    return NULL;
+
+  img = malloc(sizeof(*img));
+  if(img == NULL)
+    return NULL;
+
+  image = imlib_load_image(filename);
+  if(image == NULL){
+    free(img);
+    return NULL;
+  }
+
+  imlib_context_set_image(image);
+
+  img->image = image;
+  set_prm(img);
+
+  fb_resize_image(img, w, h);
+
+  return img;
+}
+
+int fb_draw_image(IMAGE *img, int x, int y, int sx, int sy, int width, int height)
+{
+  int i, j, r, g, b, a = 0, offset;
+
+  if(img == NULL)
+    return 1;
+
+  for(j = sy; j < sy + height && j < img->height; j++){
+    offset = j * img->width;
+    for(i = sx; i < sx + width && i < img->width; i++){
+      a = (img->data[offset + i] >> 24) & 0x000000ff;
+      r = (img->data[offset + i] >> 16) & 0x000000ff;
+      g = (img->data[offset + i] >>  8) & 0x000000ff;
+      b = (img->data[offset + i]      ) & 0x000000ff;
+
+      if(a == 0)
+	fb_pset(i + x - sx, j + y - sy, bg_r, bg_g, bg_b);
+      else
+	fb_pset(i + x - sx, j + y - sy, r, g, b);
+    }
+  }
+  return 0;
+}
+
+int fb_resize_image(IMAGE *img, int width, int height)
+{
+  Imlib_Image image;
+
+  if(width < 1 || height < 1 || img == NULL)
+    return 1;
+
+  if(width == img->width && height == img->height)
+    return 0;
+
+  image = imlib_create_cropped_scaled_image(0, 0, img->width, img->height, width, height);
+  if(image == NULL)
+    return 1;
+
+  imlib_context_set_image(img->image);
+  imlib_free_image();
+
+  img->image = image;
+  set_prm(img);
+  return 0;
+}
+
+void fb_free_image(IMAGE *img)
+{
+  if(img == NULL)
+    return;
+
+  imlib_context_set_image(img->image);
+  imlib_free_image();
+  free(img);
+}
+
+IMAGE *fb_dup_image(IMAGE *img)
+{
+  Imlib_Image image;
+  IMAGE *new_img;
+
+  if(img == NULL)
+    return NULL;
+
+  new_img = malloc(sizeof(*img));
+  if(new_img == NULL)
+    return NULL;
+
+  imlib_context_set_image(img->image);
+  image = imlib_clone_image();
+
+  if(image == NULL){
+    free(new_img);
+    return NULL;
+  }
+
+  new_img->image = image;
+  set_prm(new_img);
+  return new_img;
+}
+
+int fb_rotate_image(IMAGE *img, int angle)
+{
+  int orientation;
+
+  if(img == NULL)
+    return 1;
+
+  imlib_context_set_image(img->image);
+
+  if(angle == 90){
+    orientation = 1;
+  }else if(angle == -90){
+    orientation = 3;
+  }else{
+    return 1;
+  }
+
+  imlib_image_orientate(orientation);
+  set_prm(img);
+  return 0;
+}
+
+static void set_prm(IMAGE *img)
+{
+  if(img == NULL)
+    return;
+
+  imlib_context_set_image(img->image);
+  img->data   = imlib_image_get_data_for_reading_only();
+  img->width  = imlib_image_get_width();
+  img->height = imlib_image_get_height();
+}